When making significant changes to a DHCP scope, I always start way ahead of time and gradually reduce the lease time to something ridiculously (but appropriately) short - even on the order of 5 or 10 minutes in some cases. When the time to flip the big switch rolls around I can be well assured that all the clients are updated within the lease period after I make the drastic change. It takes a small amount of planning, but this approach hasn't failed me yet.
All that said, I pretty much agree with Ben's response. A DHCP client, is a DHCP client, is a DHCP client. Whatever implementation of the protocol that client uses shouldn't change whether its leased IP is either a reservation or truly dynamic. After all, how would it know? What I hadn't considered is the notion that a DHCP server might dole out longer lease times to clients with reservations than to dynamic clients within the same scope. I guess it's possible, but it pretty much flies in the face of the rationale for having a DHCP reservation vs a true static IP. I'm pretty sure the MS DHCP role doesn't do this, but I'm happy to be corrected if wrong. On Mon, Jun 7, 2010 at 7:08 PM, Ben Scott <mailvor...@gmail.com> wrote: > On Mon, Jun 7, 2010 at 6:53 PM, Sean Martin <seanmarti...@gmail.com> > wrote: > > Do clients with a DHCP reservation go through the same renewal process > > (check once at 50%, try again at 87.5%, etc.)? > > I believe a DHCP reservation is simply a server configuration > artifact, not something in the actual DHCP wire protocol. > > So, that would really depend on the implementation, of both server > and client. First, it will depend on what the server gives for a > lease time on reservation. I imagine a server could just use the same > lease time it does for dynamic IP addresses in the scope, or it could > issue an infinite lease time. Then it depends on the client. A > client with an infinite lease time may decide it should check in > periodically anyway, or restart its DHCP cycle for other reasons. > > -- Ben > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~
